bool类型转换,str索引和切片.

迭代
s="asdzxc"
n = 0
for c in s:
　　print(c)

# 一题
# (1)
# name = "       aleX leNb     "
# print(name.strip())
# (2)
# print(name.split("al"))
# (3)
# name = "aleX leNb"
# print(name.split("Nb"))
# (4)
# name = "aleX leNb"
# print(name.strip("a""b"))
# (5)
# name = "aleX leNb"
# lol = (name.startswith("al"))
# print(lol)
# (6)
# name = "aleX leNb"
# lol = (name.endswith("Nb"))
# print(lol)
# (7)
# name = "aleX leNb"
# lol = name.replace("l","p")
# print(lol)
# (8)
# name = "aleX leNb"
# lol = name.replace("l","p",1)
# print(lol)
# (9)
# name = "aleX leNb"
# lol = name.split("l")
# print(lol)
# (10)
# name = "aleX leNb"
# lol = name.split("l",1)
# print(lol)
# (11)
# name = "aleX leNb"
# lol = name.upper()
# print(lol)
# (12)
# name = "aleX leNb"
# lol = name.lower()
# print(lol)
# (13)
# name = "aleX leNb"
# lol = name.title()
# print(lol)
# (14)
# name = "aleX leNb"
# lol = name.count("l")
# print(lol)
# (15)
# name = "aleX leNb"
# lol = name.count("l",4)
# print(lol)
# (16)
# name = "aleX leNb"
# lol = name.index("N")
# print(lol)
# (17)
# name = "aleX leNb"
# lol = name.index("N",-1)
# print(lol)
# (18)
# name = "aleX leNb"
# lol = name.index("X le")
# print(lol)
# (19)
# name = "aleX leNb"
# print(name[2])
# (20)
# name = "aleX leNb"
# print(name[0:3])
# (21)
# name = "aleX leNb"
# print(name[-2:])
# (22)
# name = "aleX leNb"
# lol = name.index("e")
# print(lol)
# 二题
# s = "123a4b5c"
# print(s[:3])
# print(s[3:6])
# print(s[0:7:2])
# print(s[1:7:2])
# print(s[-1:])
# print(s[-3:-8:-2])
# 三题
# s="asdfer"
# n = 0
# while n< len(s):
#     print(s[n])
#     n = n + 1
# for c in s:
#     print(c)
# 四题
# s="asdfer"
# for c in s:
#     print(s)
# 五题
# s="asdfer"
# for c in s:
#     print(c+"sb")
# 六题
# s = "倒计时3秒","倒计时2秒","倒计时1秒","出发"
# for c in s:
#     print(c)
# 七题
# content = input("请输入内容").strip().split("+")
# lol = 0
# for i in content:
#     figure = int(i)
#     sum +=figure
# print(lol)
# 八题
# content = input("请输入内容").strip().split("+")
# lol = 0
# for i in content:
#     sum += int(i)
# print(lol)
# 九题:
# content = input("请输入内容:")
# sum = 0
# for i in content:
#     if i.isdigit():
#         sum +=1
# print(sum)
# 十题: